MAX16840
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MAX16840

LED Driver with Integrated MOSFET for MR16 and Other 12V AC Input Lamps

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Unique Solution Allows MR16 LED Lamps to Be Compatible with Most Electronic Transformers and is Dimmable Flicker-Free

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.74
Features
  • Cost-Effective Solution for MR16 and Other SSL Applications
    • Proprietary Input Current-Control Scheme to Achieve Electronic Transformer Compatibility and Dimmability
    • Buck, Boost, SEPIC, and Buck-Boost Topologies
    • Analog Dimming
  • Minimal Component Count Saves Cost and Space
    • Integrated 0.2Ω (max) 48V Switching MOSFET
  • Protection Features and Wide Operating Temperature Range Improves Reliability
    • Thermal-Foldback Protection
    • Output Overvoltage Protection
    • Internal Overtemperature Protection
    • Available in a 10-Pin Thermally Enhanced TDFN Package
    • Operation Over -40°C to +125°C Temperature Range
Additional Details
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The MAX16840 is an LED driver IC for lighting applications. It includes all the necessary features to design low-component-count LED drivers for 12V AC and 24V AC input (e.g., MR16) light bulbs. A proprietary input-current control scheme allows LED lamps based on this device to be compatible with electronic transformers, and dimmable with standard trailing-edge dimmers (where electronic transformers are present).

The IC can be used in buck, boost, and buck-boost topologies and features. It has an integrated 0.2Ω (max), 48V switching MOSFET.

The IC uses constant-frequency average current-mode control. It senses the input current through the voltage at the FB pin, and regulates its average. An input pin (REFI) allows the setting of the input-current level. When the voltage at this pin is set below a certain threshold, the input current is proportional to this voltage, while when that voltage is beyond the threshold, the input current is set at a fixed, predefined level. This nonlinear behavior of REFI allows its use to achieve thermal foldback, by connecting it to an NTC resistor.

The IC also features an internal overvoltage protection on the IN pin to protect the internal switching MOSFET from damage if the LED string is open or if the voltage on the LED string is too high.

The IC has a separate EXT pin that can be used to guarantee that there is a kick-start of current at turn-on for low-input voltages for proper operation with electronic transformers. EXT drives an external npn transistor. Once the UVLO threshold of 5.5V is crossed on IN, EXT is pulled to ground and the external npn transistor is turned off.

The IC is available in a 3mm x 3mm, 10-pin TDFN power package, and is rated over the -40°C to +125°C operating temperature range.

Applications

  • MR16 and Other 12V AC or DC Input LED Lighting Applications
Part Models 2
1ku List Price Starting From $2.74

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Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Jun 20, 2016

- 1612

ASSEMBLY

MAX16840ATB+

PRODUCTION

MAX16840ATB+T

PRODUCTION

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PCN

Jun 20, 2016

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ASSEMBLY

MAX16840ATB+

PRODUCTION

MAX16840ATB+T

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

MAX16840LEVKIT

Evaluation Kit for the MAX16840

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MAX16840LEVKIT

Evaluation Kit for the MAX16840

Evaluation Kit for the MAX16840

Features and Benefits

  • Input Voltages Allowed
    • 9V AC to 13.2V AC from AC Source or from Magnetic Transformers
    • 9V DC to 18V DC
    • Output of Several Electronic Transformers
  • Drives 3 to 5 Series HBLEDs
  • 46V Overvoltage Protection
  • 4W Output Power
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX16840L low-power (5W input) evaluation kit (EV kit) demonstrates the MAX16840 HBLED driver IC used for Solid State Lighting (SSL) applications. The EV kit is configured as a buck-boost topology for 3 to 5 LEDs with an output power of 4W. The device is designed for standard MR16 applications. The typical input power from 12V AC is 5W.

The EV kit is a fully assembled and tested surface-mount PCB designed and optimized to accommodate an MR16 application form factor. The EV kit is compatible with electronic and magnetic transformers.

SSL MR16 lamps face compatibility issues with electronic transformers at low power levels. If the current drawn from an electronic transformer is below a certain level it stops operating, which could cause visible flicker from the lamp. Due to compatibility issues with electronic transformers at low power levels, active power-factor correction (PFC) is not featured in this EV kit.

To improve its compatibility with electronic transformers at low power levels, an input electrolytic capacitor is included on this EV kit. For this reason, it is not dimmable.

Applications

  • MR16 and Other 12V AC or DC Input LED Lighting Applications

MAX16840EVKIT

Evaluation Kit for the MAX16840

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MAX16840EVKIT

Evaluation Kit for the MAX16840

Evaluation Kit for the MAX16840

Features and Benefits

  • Input Voltage Ranges
    • 9V AC to 13.2V AC from AC Source or Magnetic Transformers
    • 9V DC to 18V DC
    • Output of Several Electronic Transformers
  • Drives 3 to 5 Series HBLEDs
  • 36V Overvoltage Protection
  • 5.5W Output Power
  • Demonstrates IC Power-Factor Correction
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX16840 evaluation kit (EV kit) demonstrates the MAX16840 HBLED driver IC used for solid-state lighting (SSL) applications. The EV kit is configured in a buck-boost topology providing an output power of 5.5W for 3 to 5 LEDs. The IC is designed for standard multifaceted-reflector (MR) applications. The EV kit's typical input power is 6.7W at 12V AC and features a power-factor correction of 0.9 (typ).

The EV kit is a fully assembled and tested surface-mount PCB designed and optimized to accommodate an MR16 application form factor. The EV kit is dimmable with some electronic transformers and trailing-edge dimmer combination and some magnetic transformers and leading-edge dimmer combination.

Applications

  • MR16 and Other 12V AC or DC Input LED Lighting Applications

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